View Compilation Error

0_0_7822564_28921.c: In function `main':
0_0_7822564_28921.c:24: error: `monster' undeclared (first use in this function)
0_0_7822564_28921.c:24: error: (Each undeclared identifier is reported only once
0_0_7822564_28921.c:24: error: for each function it appears in.)
0_0_7822564_28921.c:24: error: syntax error before "M"
0_0_7822564_28921.c:31: error: `M' undeclared (first use in this function)